Lens-grinding apparatus.



E. A. HAMMETT. LENS GRINDING APPARATUS. APPLICATION FILED 11:12.26, 1910.

Patented N018, 1910.

2 SHEETS-SHEET 2.

11v VEN TOR.

W I a E/Ifiammeii.

W v I LA TTORNE Y.

UNITED PATENT OFFICE. I

mam a. mmnrm'or Kansas our, MISSOURI, ASSIGNOR T0 HAMMETT' Mann FACTURING COMPANY, OF KANSAS CITY, MISSOURI, A CORPORATION OF MISSOURI.

I LENS-,GRINDIMG APPARATUS.

specification of Letters Patent.

Patented Nov. 8, 1910.

Application filed February 26, 1910. Serial No. 548,046.

ence being had to the accompanying drawings, and to the letters and fi res of reference marked thereon, which orm a part of this specification.

My invention relates to improvements in lens grinding apparatus and has for its object to provide an apparatus of that class adapted for grinding and polishing toric, flat'cylinder or spherical lenses. In accomplishmg this object I have provided the improved details of structure which-will presentlybe fully described and pointed out in the claims, the preferred embodiment of my invention being illustrated in the-accompanying drawings, in which Figure I is a plan view of an apparatus constructed according to my invention and comprising four tool sets. Fig, II is an en' larged front view of a portion of the apparatus, showing two of the tool sets. Fig.

III is an end view of the apparatus, illustrated in Fig. I. Fig. IV is a front view of a portion of the apparatus, showing the reciprocating mechanism, the tool pin collar beingin vertical section. Fig.- V- is an enlarged cross section of the tool base and parts mounted thereon. Fig. VI is a detail view of an adapter used in my apparatus. Fig. VII is a detail view of one of the sleeves carried on the reciprocatory shaft.

Referring more in detail to the parts :-1 designates the frame of the apparatus upon which are supported the transverse parallel rails 2, the upper portions of which are provided with dove-tail flanges 3.

Mounted on the rails 2 is a tool base 4 having dove-tailed slots within which the upper portions of the rails 2 and the flanges 3 are fixed to permit sliding travel of the base without lost motion.

Fixed on base 4, preferabl by bolts 5 is a plate "6 having sockets at intervals throughout its length adapted for receiving shanks 8 of lehs grinding tools. 9.

Extending transversely through one side of the plate 6 are sockets 10 into which the set screws 11 are threaded in order that they may engage the tool shanks and hold same rigidly in position.

Extending transversely through the tool base 4' are a ertures 12 within which the rods 13 are a apted to revolve. The ends of rods 13 project laterally beyond the sides of said base and mounted upon said projecting ends are-the slotted arms 14 which project uplwardly beyond "the top of the tools 9 w en the latter are in ositio-n. The slotted arms 14 are held rigidly to the r0ds 13 by means of pins 15' which exten'd through the arm hubs and through said rods. The rods 13 may also be provided withthe bolt heads 16 and nuts17 which ma'yassist in holding said arms inposition. When the parts areassembled, the arms 14 are adapted for free revoluble movement, lengthwise of the base 4; such movement being limited .by an adapter which will presently be described and also by the posts 18 which are mounted on base 4 and project laterally therefroma Also mounted on frame 1 are the bearing brackets 19, within which a drive shaft 20 is revolubly mounted; said shaft being provided with the ordinary tight and loose pulleys 21'-22 'forjconnection with a suitable driving power, not shown.

Fixed on shaft 20 are the eccentrics 23, havingpitmen 24 which are pivotally connected with the ends of the tool base 4", so

that when the drive shaft is o erated, the

tool base will be moved forward y and back on the rails through such eccentric connection.

Revolubly mounted in bearings 19 above the drive shaft is an. arm shaft 25 which is adapted for longitudinal reciprocation in its bearings. Oh one ofthe brackets 19'is a vertically disposed bearing, 26 within which is revolubly mounted a shaft 27 having beveled gear connection 28 with the drive Shaft 20. i

29. designates an eccentric having a hub 30 which is fixed to the upper portion of shaft 27 by a setscrew 31 and engages the. upper face of the bearing 26 in a manner to" support the eccentric and shaft.

32 designates a pitman which connects the eccentric 29 with the arm shaft .25.

Revolubly'mounted on arm shaft 25 are a number of sleeves 33 which abut against and set collars ject forwardly over the base 4. The arms 37 are fixed in adjusted position in said collar by the set screws 38. Fixed to the forward ends of said arms are the four way fittings 41, the forward neck of each of which carries an extension arm 42 upon which is slidably'mounted a weight 43 which" may be fixed in an adjusted position on the arm by a set screw 44.

Extending vertically through each fitting 41 is a pin 45 which may be fixedwithin the fitting by'a set screw 46. The lower end and project through the and. the s of pin 45 is pointed in order that it may move freely in its seat in the socket 47 of a' lens plate tion. I

49 designates an adapter which I use with my apparatus and which consists of the bod member 49 having an aperture into whic the shank 48' of the lens to project and the forwardly and back 48 when the parts are in operaplate 48 is adapted rom the adapter body slots in the arms 14 when the parts are assembled.

' 51 designates a piece of lens glass which is attached to. the plate 48 and is held in contact with the grinding face of the tool 9.

The 0 lows assembled as described,that is with the tool base slidabl liafts and eccentrics properly mounted and connected, the tool parts are prepared for the rinding operation by insertlng the tool sganks into the sockets of platw 6 and tightening same by the set screws 11. A lens piece is then secured to the flat face of the lens late 48 and the plate shank fitted into t e adapter 49. The adapter pins are then fitted into the arm slots, so that the lens 43 may then be fixed at desired, the weight the fitting when a thin lens is to beground ati ng parts are w the piece may seat in the tool curve. Each arm 37 is then turned until the point of the pin 45 enters the socket in the lens plate, so that the-weight of said arm will bear the lens piece against the tool surface. The wei ht the required istance from the fittin to give the pressure being held nearer, to

than for a. thick lens, or for rough work. If more than one lens is to be ground at the same time, the other tools and i306 erassembled as describe it being possible to simultaneously grind man lenses as may be assembled on the base 4. hen the parts have been assembled, the drive shaft is started in operation and ill reciprocate the base 4 transversely of frame through the eccentric and pitman pound curve of given ins 50 which extend mounted on the dove-tail rails for carrying a lens .socket of the right an 10 across the tool, the right a le travel 0 the lens carrier being assured y the guiding of the pins50, by the slot arms 14. Inasmuch as the cross movement is not uniform, the each other, so that a twisting, grinding effect is produced.

' With this apparatus it is-possible to accurately grind either a imensions and' to simultaneously grind lenses of different curvature.

Having thus described m invention, what I claim as new therein and desire to secure by Letters-Patent is i- I 1. In a lens grinding apparatus, a suitable frame, a base adapted for reciprocatory movement on said frame, a shaft adapted for reciprocatory movement on said frame, at a right angle to the movement of said base, a sleeve revolubly mounted on said shaft, an arm "fitted on said sleeve, a four parts move irregularly acrossspherical or a com-- way fitting fixed on the free end of-said arm,

an extens1on arm fitted in said fitting, a weight adjustable on said extensionarm, a

proximity to said base, and-means for actuating said base and said shaft from a common driving mechanisi.

2. In a lens said frame, arms ivotally mounted on said base and provi ed with longitudinal slots means on said base for holding optical tools, a device plate and-comprising a socketed head, and ins fixed in said head and projected thron and arms 37 adapter? for movement over said base and having pins depending into position for engaging a lens plate, substantially as set forth.

3. Ina lens grinding ap aratus, a suitable frame, a base su ported means on said base or holding a lens tool, a lens tool carried by comprising a socketed head having laterally pro ecting pins, a lens plate having a shan projecting into the adapter socket, arms ivotally mounted on said base and havin ongitudinal slots through which the a apter pins are projected, an arm 37, and a pin carried by said arm 37 and having a pointed end engagin'gsaidlens plate, substantially as and for the. purpose set forth.

4. In a lens grinding apparatus, a suitable frame, a base adapted for reciprocatory movement on said frame, a rod extending transversely throughsaid base and ada ted for revoluble movement, a slotted arm liked said means, an adapter -pin fitted on said fitting and projecting into eration of myapparatus 1s as-fol- 5' resuming the machine parts to be grinding apparatus I a suitable frame,,a base mounted on 7 the slots in said arms,

on said frame,

on each end of said rod, a plate fitted on said base and provided with a vertical socket for receiving tool shanks and with a lateral screw socket openin into said first named socket, an optical too having a shank seated in said vertical socket, a set screw threaded into said lateral socket and against the shank, an adapter comprising a socketed body and pins projecting from the body into the slots in said arms, a lens plate having a shank located in the adapter socket, an arm 37 ada ted for-reciprocatory movement over said ase, a pin having a pointed end seated on said lens plat and means for reciprocating said tool base and arm 37 in transverse paths.

5. In a lens grind ng apparatus, a suitable frame, a base adapted for transverse reclprocatory movement on said frame, rods extending transversely through said base and adapted for revoluble movement therein, slotted arms fixed at opposite ends of said rods, stop members projecting laterally from said base and adapted for engagement by impinging said arms, a plate fixed on said base and provided with a vertical socket and with a lateral socket opening into said vertical socket,

an optical tool having a shank projected into said vertical socket, an adapter comprising a socketed head having pins projecting laterally therefrom, into the arm slots, a lens plate having asha-nk projected into the adapter socket, sa-id shank having a beveled socket in its upper, face, a shaft Cadapted for recipro- ELBERT A. HAMMETT.

Witnesses:

MYRTLE JACKSON, E. A. CAIHLL. 

